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Pension Plans and Other Postretirement Benefits (Details 17) (Pension Benefits [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Multiemployer Plan Disclosure [Line Items]      
Company Contributions $ 4.7us-gaap_MultiemployerPlanPeriodContributions $ 5.0us-gaap_MultiemployerPlanPeriodContributions $ 5.6us-gaap_MultiemployerPlanPeriodContributions
Steelworkers Western Independent Shops Pension Plan [Member]      
Multiemployer Plan Disclosure [Line Items]      
EIN 900169564    
Pension Plan Number 001    
Pension Protection Act Zone Status Green [1] Red [1]  
FIP / RP Status Pending / Implemented NA [2]    
Company Contributions 1.1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan1Member		 1.0us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan1Member		 1.3us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan1Member
Surcharge Imposed No [3]    
Expiration Dates of Collective Bargaining Agreements Jun. 30, 2015    
Boilermakers-Blacksmiths National Pension Trust [Member]      
Multiemployer Plan Disclosure [Line Items]      
EIN 486168020    
Pension Plan Number 001    
Pension Protection Act Zone Status Yellow [1] Yellow [1]  
FIP / RP Status Pending / Implemented Implemented [2]    
Company Contributions 2.0us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan2Member		 2.2us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan2Member		 2.4us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan2Member
Surcharge Imposed No [3]    
Expiration Dates of Collective Bargaining Agreements Sep. 30, 2018    
IAM National Pension Fund [Member]      
Multiemployer Plan Disclosure [Line Items]      
EIN 516031295    
Pension Plan Number 002    
Pension Protection Act Zone Status Green [1] Green [1]  
FIP / RP Status Pending / Implemented NA [2]    
Company Contributions $ 1.6us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan3Member		 $ 1.8us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan3Member		 $ 1.9us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_MultiemployerPlanNameAxis
= ati_Multiemployerplan3Member
Surcharge Imposed No [3]    
Expiration Dates of Collective Bargaining Agreements, First Date Feb. 25, 2018 [4]    
Expiration Dates of Collective-Bargaining Agreements, Last Date Jul. 14, 2019 [4]    
[1] The most recent Pension Protection Act Zone Status available for ATI’s fiscal years 2014 and 2013 is for plan years ending in calendar years 2013 and 2012, respectively. The zone status is based on information provided to ATI and other participating employers by each plan and is certified by the plan’s actuary. A plan in the “red” zone had been determined to be in “critical status”, based on criteria established by the Code, and is generally less than 65% funded. A plan in the “yellow” zone has been determined to be in “endangered status”, based on criteria established under the Code, and is generally less than 80% funded. A plan in the “green” zone has been determined to be neither in “critical status” nor in “endangered status”, and is generally at least 80% funded.
[2] The “FIP / RP status Pending / Implemented” column indicates whether a Funding Improvement Plan, as required under the Code by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” zone, is pending or has been implemented as of the end of the plan year that ended in 2014.
[3] The “Surcharge Imposed” column indicates whether ATI’s contribution rate for 2014 included an amount in addition to the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical status”, in accordance with the requirements of the Code.
[4] The Company is party to five separate bargaining agreements that require contributions to this plan. Expiration dates of these collective bargaining agreements range between February 25, 2018 and July 14, 2019.